NDLI: Mercury Extraction from Contaminated Soils by l-Cysteine: Species Dependency and Transformation Processes

Content Provider	Springer Nature Link
Author	Bollen, Anne Biester, Harald
Copyright Year	2010
Abstract	A new approach in soil remediation washing techniques is the use of l-cysteine based on the formation of organic complexes. In this study, the applicability of l-cysteine for the mobilisation of different mercury species from contaminated soils was evaluated. Soils were treated with l-cysteine solutions with S–Hg molar ratios of 1, 2, 10, 20, 100 and 200. In 24 h batch experiments, leachates with water could mobilise 1% of Hg. The addition of l-cysteine led to an increase of Hg mobilisation of 42% for soils with inorganically bound Hg. In column experiments, the maximum Hg removal rate was 75%. For soils with organically bound Hg or HgS, only 1–5% of Hg was mobilised. Thus, the extraction of Hg from soils with l-cysteine is highly dependent on the Hg-binding form. Hg speciation analyses of leachates indicate that Hg–l-cysteine complexes are labile complexes which can be easily transformed. Soil samples speciation analysis revealed that reduction to elemental mercury takes place at low S–Hg ratios (1 to 10), assumingly by microbial activity. At higher S–Hg ratios of 10 and 100, precipitation of stable Hg–S complexes could be observed. These species transformation processes are limitations for considering l-cysteine leaching as a remediation strategy.
Starting Page	175
Ending Page	189
Page Count	15
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	219
Issue Number	1-4
e-ISSN	15732932
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-11-24
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mercury Speciation Soil remediation Cysteine Metal extraction Climate Change Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Environment Soil Science & Conservation Hydrogeology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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